[Beowulf] mpirun command

Gus Correa gus at ldeo.columbia.edu
Fri Dec 4 13:04:51 PST 2009

Hi Christian

Your default mpirun seems to be the old LAM MPI.
Do "which mpirun", "mpirun --showme".

You can use the full path name to your MPICH mpirun.
You should also use the full path name to MPICH mpicc to compile
cpi.c, for compatibility.
It is likely that both are somewhere in your /mirror/mpich-1.2.7p1/
directory tree.
I would guess  /mirror/mpich-1.2.7p1/mpicc
and /mirror/mpich-1.2.7p1/mpirun, but you need to check.

Well, MPICH-1 is also old, and often problematic.
Better upgrade from MPICH1 to MPICH2 and/or from LAM/MPI to OpenMPI,
which are open source and relatively easy to build using
the free Gnu compilers (gcc, gfortran):


You may also take a look at their mailing lists,
for specific help w.r.t. MPI.

If you are on Linux,
there are also MPICH2 RPMs for some Linux distributions:


My $0.02
Gus Correa
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA

christian suhendra wrote:
> hello guys...
> im using mpich-1.2.7p1 installed on my PC
> but when i run mpirun
> i've got this error :
> suhendra18 at cluster2:/mirror/mpich-1.2.7p1/examples$ mpirun -np 1 cpi
> -----------------------------------------------------------------------------
> It seems that there is no lamd running on the host cluster2.
> This indicates that the LAM/MPI runtime environment is not operating.
> The LAM/MPI runtime environment is necessary for MPI programs to run
> (the MPI program tired to invoke the "MPI_Init" function).
> Please run the "lamboot" command the start the LAM/MPI runtime
> environment.  See the LAM/MPI documentation for how to invoke
> "lamboot" across multiple machines.
> -----------------------------------------------------------------------------
> did my mpich switch to LAM/MPI?? so what should i do??
> regards
> christian
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